What should i do about my boyfriend and our relationship.?

my boyfriend and i have been 2gether for 8 months its ben a little ruff this past month and a half wer not as close as we once wer wen he calls he get off the fone in like 5 mins and doesnt usualy call bak he doesnt tell me that he loves me anymore i kno that hes ben a little stressd out over findin a job and moving out of his dads house but i dont even put any pressure on him at all i use to give him everything but ive ben very annoyd bkuz ive tried talkin 2 him and he claims that hes gona change and that he realy does stil love me but wen he acts like this it drives me crazy why does it seem to me that hes only nice wen he want and i kno that the is realy good he tells me everytime that im the best that he ever had so i dont kno if hes seein someone else but damn i think that im such a good girlfrend 2 him so why is he treating me this way is it time to break up or shud i keep tryin a little longer im 18 and hes 21 we use 2 talk about getin engaged n movin in 2gether but not anymore wut shud i do.?